Side-tracked with a present-making for Christmas:
Used a 60deg V-bit single pass 3mm deep and 5% stepover.
Feed rate 2500mm/min at 9K rpm (Not Xcarve) so the full carve took approx 30minutes. The board is 280x450mm bamboo.
Laid the epoxy on thick and ended up skim-cutting the board once cured vs sanding the excess off.
3000mm/min and 0.5mm depth per pass using a 20mm flat bit, no apparent heat build-up